Study On The Solar Radiation Characteristic Under The Artificial Forest And Its Affect To Planting Ginseng

Cultivating the ginseng under the forest is a high-effect complex ecotypic and economic system. Its development can have effect controlling and decrease the forest destroyed area for seeding ginseng , can give birth to the ginseng with the wild characteristic and no contamination, can relieve the contradiction between the forestry with high organism's habits beneficial result and ginseng crop farming with high economic effect. On the condition that the ginseng market is stagnant and the forest resource is dried up, cultivating the ginseng under the forest becomes more and more significative.As a high-priced crop, cultivating the ginseng under the forest is still lack of systemic science research currently. Our study is exactly research on the relationship between the overground part of ginseng and the most important factor- the solar radiation in the forest. And we also study on the model of the solar radiation characteristics in the plantation forest. All of the work provide technical basis for cultivating ginseng under the forest.As the main source of the energy for the forest-agriculture system, solar radiation is very important for the growth of the ginseng. Further more, solar radiation under the forest is affected by the crown of the trees which overshadow the ground, compared with the solar radiation cast on the surface layer we generally study, it is evidently more complicated and stochastic, however, no other than this distinct solar radiation obviously effected by the crown of the trees is a good influence on the growth of the ginseng, it makes the same environment to the wild ginseng for the ginseng under the forest, make it grow more slowly and have more economic value, therefore, study on the solar radiation characteristic in the plantation forest and its affect to the ginseng is very important.Based on the past research, this text studies on the solar radiation which is the most important factor to the growth of the ginseng under the forest, and combines it to the growth of the ginseng, analyze systematically the effect of the solar radiation to the ginseng in the forest. The concrete work is as follow:1. Based on the past research, set up the model of the solar radiation on the sloping field with no effect of the crown of the trees, besides the simulation of the solar radiation of the sunshine sky , we also considered the effect of the cloud to the solar radiation via the Nonlinear Least Squares method. And then we proved the correctness of the model by the experimentation. The model not only can be used independently, but also can be the input of the solar radiation model in the forest, and then make the solar radiation model in the forest more integrated and more applied.2. according to the theoretical research on a model for predicting the shadow boundary of an individual conical crown on a slope, we established the neighborhood interference model, and in the area of this neighborhood, we calculated the accumulative distance, it provided a restrict condition which can raise the accuracy quit a lot for the model for the solar radiation under the forest.3. Based on the primary model for the solar radiation, we considered the character of the crown of the trees and its effect to the solar radiation under the forest, used the Beer's law, set up the model of the solar radiation characteristic under the plantation forest with the conical crown on a slope. The model describes the disciplinarian of the solar radiation transferred in the conical crown on a slope and the distribution of the solar radiation under the forest in detail. Then we proved it by the experiment accomplished at the forest reserve in Jingyue park of Changchun. It can simulate the solar radiation of arbitrary landform at any time. This research can provide the evidence for work of the ginseng cultivated under the forest, it can combine the forestry with high organism's habits beneficial result and ginseng crop farming with high economic effect, therefore, it develops the holistic function of the system, so it has a wide future. Moreover, the experiment of the validation for the model is set under the artificial forest whose environment is the same to the ginseng plangting unger the forest.4. our proving ground is at the forestry centre in Meihekou city, Jilin province. We mensurated the solar radiation and the character of ginseng's growth at the same time, then analyzed the data by the correlation, proced the great effect of the solar radiation to the growth of the ginseng and discussed the physiological character of the ginseng, found the best solar radiation for the growth of the ginseng. All of the work provides academic foundation for the Cultivating of ginseng under the forest.